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EP-4742436-A1 - IMMERSION LIQUID-COOLING TANK AND BATTERY PACK

EP4742436A1EP 4742436 A1EP4742436 A1EP 4742436A1EP-4742436-A1

Abstract

An immersion liquid cooling box and a battery pack are provided in this application. The immersion liquid cooling box includes a box body. An immersion chamber for placing battery cells are formed in the box body. A liquid inlet and a liquid outlet of the immersion chamber are formed on an outer surface of the box body. The liquid inlet and the liquid outlet are formed on two opposite sides of the box body in a width direction.

Inventors

  • LU, YIMING
  • XIAO, Peng
  • LI, Xingyao
  • ZHENG GUANGYI

Assignees

  • Eve Energy Co., Ltd.

Dates

Publication Date
20260513
Application Date
20241106

Claims (15)

  1. An immersion liquid cooling box, comprising: a box body, an immersion chamber for placing battery cells being formed in the box body, a liquid inlet and a liquid outlet of the immersion chamber being formed on an outer surface of the box body, the liquid inlet and the liquid outlet being formed on two opposite sides of the box body in a width direction of the box body.
  2. The immersion liquid cooling box according to claim 1, wherein the liquid inlet and the liquid outlet are both located at a middle part of the box body along a height direction of the box body; and/or, the liquid inlet and the liquid outlet are both located at a middle part of the box body along a length direction of the box body.
  3. The immersion liquid cooling box according to claim 2, wherein the liquid inlet is configured to inject immersion liquid into the immersion chamber, and a flow rate of the immersion liquid at the liquid inlet is Q, satisfying: 8 L/min ≤ Q ≤ 20 L/min.
  4. The immersion liquid cooling box according to any one of claims 1 to 3, wherein a liquid inlet pipeline is arranged on a chamber wall of the immersion chamber, the liquid inlet pipeline extends along the length direction of the box body, one end of the liquid inlet pipeline is in communication with the liquid inlet, and at least two liquid spray ports are formed at another end, at least two battery cells are arranged in the immersion chamber along the length direction of the box body, and each of the liquid spray ports is corresponding to one of the battery cells.
  5. The immersion liquid cooling box according to claim 4, wherein a liquid spray pipe is in communication with each of the liquid spray ports, the liquid spray pipe extends along the width direction of the box body, and wherein the liquid spray pipe is perpendicular to an outer surface of one corresponding battery cell.
  6. The immersion liquid cooling box according to claim 4 or 5, wherein a liquid outlet pipeline is arranged on the chamber wall of the immersion chamber, the liquid outlet pipeline extends along the length direction of the box body, one end of the liquid outlet pipeline is in communication with the liquid outlet, and at least two through holes are formed at another end, and each of the through holes is corresponding to one of the battery cells.
  7. The immersion liquid cooling box according to claim 6, wherein the liquid spray ports and the through holes are both formed at a middle part of the box body along the height direction of the box body, and the liquid spray ports are in a one-to-one correspondence with the through holds along the length direction of the box body.
  8. The immersion liquid cooling box according to any one of claims 1 to 7, wherein a placement bracket is arranged on a top surface and/or a bottom surface of the box body, and the placement bracket is configured to fix the battery cells.
  9. The immersion liquid cooling box according to claim 8, wherein installation areas are formed at the placement bracket, the installation areas includes m installation positions distributed along the width direction of the box body, the installation positions are configured to fix the battery cells, and along the length direction of the box body, there are n installation areas, satisfying: 0 < m < n, and both m and n are integers.
  10. The immersion liquid cooling box according to claim 9, wherein m installation positions are arranged at intervals along the width direction of the box body to form a plurality of first gaps among a plurality of battery cells, n installation areas are arranged at intervals along the length direction of the box body to form a plurality of second gaps among the plurality of battery cells, and the plurality of first gaps are in communication with the plurality of second gaps to form flow guidance channels.
  11. The immersion liquid cooling box according to claim 10, wherein a width of the flow guidance channels is D, satisfying: 2 millimetres ≤ D ≤ 4 millimetres.
  12. The immersion liquid cooling box according to any one of claims 9 to 11, wherein the battery cells comprise cylindrical battery cells, and the installation areas in odd rows are distributed in a staggered manner with the installation areas in even rows.
  13. The immersion liquid cooling box according to claim 12, wherein one flow guidance region is formed between every at least two adjacent battery cells, and the flow guidance regions are configured to allow the immersion liquid to flow through.
  14. The immersion liquid cooling box according to claim 13, wherein one flow guidance region is formed between every three adjacent battery cells, a cross-section of the flow guidance region in a horizontal direction is circular and is circumscribed by the three battery cells, wherein a radius of the flow guidance region is R1, a radius of the battery cells is R2, satisfying: 1/6 ≤ R1/R2 ≤ 1/4.
  15. A battery pack, comprising the immersion liquid cooling box according to any one of claims 1 to 14.

Description

This application claims the priorities to Chinese Patent Applications Nos. 202422322693.8 and 202411329224.7, submitted to the Chinese Patent Office on September 23, 2024, the contents of all of which are incorporated by reference in their entirety. TECHNICAL FIELD This application relates to the field of battery technologies, and in particular to an immersion liquid cooling box and a battery pack. BACKGROUND In the field of battery technologies, cooling structures are often used to lower temperature of battery cells in a battery module to ensure the safety of the battery in use. In related technologies, a liquid cooling bottom plate can be used to regulate the temperature of the battery cells, and immersion liquid cooling can also be used to regulate the temperature of the battery cells. SUMMARY In the immersion liquid cooling, immersion liquid typically flows into an immersion chamber from a bottom plate and flows out of the immersion chamber from a position close to a top plate. A liquid inlet and a liquid outlet are arranged on two opposite sides of a box body in a length direction of the box body. As a result, a flow path of the immersion liquid is long, leading to a significant temperature difference between battery cells at the liquid inlet and battery cells at the liquid outlet. An immersion liquid cooling box is provided in the present application. The immersion liquid cooling box includes a box body, and an immersion chamber for placing battery cells is formed in the box body. A liquid inlet and a liquid outlet of the immersion chamber are formed on an outer surface of the box body. The liquid inlet and the liquid outlet are located on two opposite sides of the box body along a width direction of the box body. A battery pack is further provided in the present application. The battery pack includes the immersion liquid cooling box mentioned above. Beneficial effects The immersion liquid cooling box according to this application is configured to form a liquid inlet and a liquid outlet on two opposite sides of a box body in a width direction, so that immersion liquid flows along the width direction of the box body, thereby shortening a flow path of the immersion liquid, lowering a temperature difference among battery cells, and extending the service life of a battery. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective schematic diagram of a box body according to embodiments of the present application.Figure 2 is a schematic diagram showing the arrangement of battery cells according to the embodiments of the present application.Figure 3 is a sectional view of a box body with battery cells placed therein according to the embodiments of the present application.Figure 4 is a sectional view of a box body without battery cells placed therein according to the embodiments of the present application.Figure 5 is a streamline diagram of immersion liquid in an immersion liquid cooling box according to the embodiments of the present application.Figure 6 is another streamline diagram of immersion liquid in an immersion liquid cooling box according to the embodiments of the present application.Figure 7 is still another streamline diagram of immersion liquid in an immersion liquid cooling box according to the embodiments of the present application. Reference numerals in the accompanying drawings: 10, box body; 110, immersion chamber; 120, liquid inlet; 130, liquid outlet; 20, liquid inlet pipeline; 210, liquid spray port; 220, liquid spray pipe; 30, liquid outlet pipeline; 310, through hole; 320, liquid discharge pipe; 40, installation area; 410, installation position; 50, flow guidance channel; 510, first gap; 520, second gap; 60, battery cell; 70, flow guidance region. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Please refer to Figure 1 to Figure 7, embodiments of the subject application provide an immersion liquid cooling box. The immersion liquid cooling box includes a box body 10. An immersion chamber 110 for placing battery cells 60 is formed in the box body 10. A liquid inlet 120 and a liquid outlet 130 of the immersion chamber 110 are formed on an outer surface of the box body 10. The liquid inlet 120 and the liquid outlet 130 are formed on two opposite sides of the box body 10 in a width direction of the box body. In the embodiments of the present application, the liquid inlet 120 and the liquid outlet 130 are formed on two opposite sides of the box body 10 in the width direction thereof, so that immersion liquid can flow along the width direction of the box body 10, thereby shortening a flow path of the immersion liquid, lowering a temperature difference between the battery cells 60, and extending the service life of the battery. It can be understood that the liquid inlet 120 is served as an inlet for the immersion liquid to flow into the immersion chamber 110, and the liquid outlet 130 is served as an outlet for the immersion liquid to flow out of the immersion chamber 110. The immersion li